<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
      .jk{
        color: brown;
      }
    p.jk{
        font-size: 50px;
    }   
    div>h3{
        color: blue;
    }


    </style>
</head>
<body>
    <div>
        <p class="jk">你好哥们</p>
        <span class="jk">你好啊</span>
        <h3>我是哥们</h3>
    </div>


</body>
</html>